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Find your perfect ring size using one of the methods below. Because finger sizes naturally fluctuate, we highly recommend measuring at the end of the day when your fingers are at their largest.

How to Measure

Method 1: The String or Paper Method

1. Wrap a thin strip of paper or a piece of string snugly around the base of your intended finger.
2. Use a pen to mark the exact point where the ends overlap.
3. Lay the string or paper flat and measure the length in millimeters with a ruler. This is your finger's circumference.
4. Divide the circumference by 3.14 to calculate your diameter, and match it to the chart below.

Method 2: The Existing Ring Method

1. Find a ring that already fits well on the specific finger you are measuring.
2. Place the ring flat on a ruler and measure the inner diameter in millimeters, measuring directly straight across the widest point of the circle.
3. Match the millimeter measurement to the diameter column in the chart below.

US Ring Size Chart

• Size 3 — 14.1mm diameter / 44.3mm circumference
• Size 3.5 — 14.5mm diameter / 45.5mm circumference
• Size 4 — 14.9mm diameter / 46.8mm circumference
• Size 4.5 — 15.3mm diameter / 48.1mm circumference
• Size 5 — 15.7mm diameter / 49.3mm circumference
• Size 5.5 — 16.1mm diameter / 50.6mm circumference
• Size 6 — 16.5mm diameter / 51.8mm circumference
• Size 6.5 — 16.9mm diameter / 53.1mm circumference
• Size 7 — 17.3mm diameter / 54.4mm circumference
• Size 7.5 — 17.7mm diameter / 55.6mm circumference
• Size 8 — 18.1mm diameter / 56.9mm circumference
• Size 8.5 — 18.5mm diameter / 58.1mm circumference
• Size 9 — 19.0mm diameter / 59.5mm circumference
• Size 9.5 — 19.4mm diameter / 60.8mm circumference
• Size 10 — 19.8mm diameter / 62.1mm circumference
• Size 10.5 — 20.2mm diameter / 63.5mm circumference
• Size 11 — 20.6mm diameter / 64.6mm circumference

Expert Tips for Accuracy

• Measure your knuckle: If your knuckle is noticeably larger than the base of your finger, measure both areas and select a size in between. The ring must be able to clear the knuckle without being too loose at the base.
• Account for fluctuations: Fingers shrink in cold weather and swell in the heat. Measure at room temperature, ideally at the end of the day.
• Test for consistency: Measure your finger 2 to 3 times on different days to ensure the most accurate average.
• Factor in band width: Wide bands fit more tightly than thin ones. If your chosen ring has a band width of 5mm or wider, consider going up a half size for a comfortable fit.
• When in doubt, size up: If your measurement falls right between two sizes, always opt for the larger size to ensure comfort.